Metallic-filament electric incandescent lamp.



I H. C. G. REMANE.

METALLIC FILAMENT ELECTRIC INCANDESCENT LAMP.

APPLICATION FILED OCT. 3. I912.

1,176,602. Patented Mar. 21, 1916.

Fig. l.

Witnesses: H g g I m4 ermann emane:

I fi/{M I W Hls fittorney.

UNITED STATES PATENT OFFICE.

HERD/[ANN c. e. REMANE, or BERLIN, GERMANY, ASSIGNOR 'ro GENERALELECTRIC COMPANY, A ccaromrron or NEW YORK.

METALLIC-FILAMENT ELECTRIC INCANDESCENT LAMP.

Specification of Letters Patent.

Patented Mar. 21,1916.

Application filed October 3, 1912. Serial No. 723,671.

'ments in Metallic-Filament Electric Incandescent Lamps, of which thefollowing is a specification.

The present invention relates to metallic-filament incandescent electriclamps in which the illuminating body is carried back and forth overfilament supports of a holderframe.

Electric incandescent lamps are already known in which the illuminatingbody is placed zigzag upon the holders which are arranged in twoparallel planes on a common supporting stem. Also constructions areknown in which the parts of the illuminating body which lie between theholders are clamped in at the supporting parts of the rigid holders orin some other manner are firmly connected with them. If, in the mannerusual for illuminating bodies consisting of looped metal filaments,slender elastic holders are used on one supporting ring, and for theholders of the other supporting ring practically non-elastic material isemployed, it has been demonstrated that the elastic holders may bestrained beyond their limit of elasticity by very severe shocksoccurring in the direction of the supporting stem. By this means theelastic holders are so bent that. the illuminating body comes out ofengagement with the holders over which it is carried.

In order to preserve the elastic holders which cause the sections of theilluminating body to remain stretched rectilinearly during the burningof the lamp, the illuminating body, according to my invention, isinterlaced with the practically rigid holders in such a way that forceswhich are exerted by shocks in an axial direction are taken up by theseholders without detriment to the position of the illuminating body or tothe elastic supports. This may be attained by interlacing theilluminating body with the rigid holders when applied, as shown in thedrawings. Provision is also made which prevents the illuminating bodyfrom sliding from the holders.

In the drawing are represented a number of forms of the inventive idea.

The simplest solution is shown in Figure 1,

, according to which the illuminating body 1 is given one turn about therigid holder in the curved portions of the hooked ends- 2. In theembodiment shown in Fig. 2, the filament is also given one turn aroundthe support and protection against sliding off in the direction of theholder is secured by a dove-tail form 3 in the supporting portion.

In Fig. 3 is shown a construction in which the supporting end of theholder is bent into a helical eye 4. By this arrangement an advantage issecured in that, when axial blows occur, the sections of theilluminatlng body may be supported not only with relation to the holderitself, but also with relation to the lower curved portion of the Vhelical eye.

In the construction shown in Fig. 4, a curvature 55 is provided at bothsides "of the looped portion where the filament is wound round; thisalso with a view to further assisting in preventing the illuminatingbody from slipping off the holder and limiting its longitudinalmovement.

In the construction shown in Fig. 5, a projection 6 provided near theend of the holder passes through the turns of the illuminating body toprevent the filament from slipping off the end of the support and limitits longitudinal movement.

In Figs. 6 and 7 holders are represented, which are S-shaped at theends, by which design the illuminating body is held in position againstlateral and longitudinal movement by a sort of weaving, as clearly shownin the drawings.

In Figs. 8 and 9 are represented embodiments in which the illuminatingbody is interlaced with the individual curvatures in the wave-like endsof the supports similar to a weaving operation. In the embodiment shownin these figures it will be noticed that the filament and the supportare so interlaced that the filament has no movement along the axis ofthe support and only a limited movement in a transverse directionthereto. In this arrangement it is not only possible to so arrange thebent or curved portions of the support that they lie in a plane whichpasses through the axis of the lamp,'but it is also possible to disposethem perpendicularly to the supporting stem or in planes tangential tothe embracing ends of the illuminating body.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is,-

1. In an incandescent lamp, the combination of a central supportingstem, a set of .tion'of a central supporting stem,

hooked flexible/supports mounted thereon, a set of comparatively rigidsupports mounted thereon, and a continuous filament strun back and forthbetween said flexible and rigid supports, the rigid supports and thefilament being interlaced to limit the movementof the filament towardand from said rigid supports.

2. In an incandescent lamp, the combinaa p urality of hooked flexiblesupports mounted thereon, a plurality of rigid supports mounted thereon,said rigid .supports having bent portions, and a filament strung backand forth between said flexible and rigid supports and interlaced withthe bent portions of said rigid supports to limit the longitudinalmovement of the filament toward and from said rigid supports.

3. In an incandescent lamp, the combination of a' central supportingstem, a plurality of hooked flexible supports mounted thereon, aplurality of rigid supports mount; ed thereon, said rigid supportshaving bent portions, and a continuous filament strung back and forthbetween said flexible and rigid supports and interlocked with the bentportions of said rigid supports to prevent undue strain on said flexiblesupports.

4. In an incandescent lamp, the combination of a central supportingstem, a plurality of hooked flexible supports mounted thereon, aplurality of rigid supports mounted thereon, said rigid supports havingbent portions, and a continuous filament strung back and forth betweensaid flexible and rigid supports, the filament being interlaced with thebent portions of said rigid supports whereby the movement of thefilament toward and from the ri 'd support is limited and undue strainon t e flexlble support is thereby prevented.

5. The combination in an incandescent lamp of a rigid filament supportand a filament interlaced therewith in such a man-.

ner as to limit the movement of the filament with respect to thesupport.

6. The combination in an incandescent lamp of a rigid filament supporthaving a bent portion and a filament interlaced with said bent portionin such a manner as" to limit the movement of the filament withrespectto the support.

7. The combination in an incandescent lamp of a filament support havinga bent portion near the end and a filament interlaced with the bentportion in such a manner as to limit the movement of the filament withrespect to the support.

8. The combination in an incandescent lamp of a rigid filament supporthaving a plurality of bends near the end thereof and a filamentinterlaced with the bent portion in sucha manner as to limit themovement of the filament with respect to the support. In witnesswhereof, I have hereunto set my hand this 13th day of September, 1912.

HERMANN 0. REMANE.

Witnesses WOLDEMAR .HAUPT, HENRY 'HASPER.

